Mercurial > hg > digilib-old

annotate servlet/src/digilib/servlet/PDFCache.java @ 552:785fc58b68b1 digilibPDF

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more cleanup and refactoring
author robcast
date Wed, 15 Dec 2010 08:58:01 +0100
parents f9a4288fc7c4
children 88ed97d08b97
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1 package digilib.servlet;
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2
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3 import java.io.BufferedInputStream;
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4 import java.io.File;
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5 import java.io.FileInputStream;
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6 import java.io.FileNotFoundException;
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7 import java.io.FileOutputStream;
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8 import java.io.IOException;
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9 import java.io.OutputStream;
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10 import java.util.concurrent.Future;
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11
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12 import javax.servlet.RequestDispatcher;
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13 import javax.servlet.ServletConfig;
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14 import javax.servlet.ServletContext;
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15 import javax.servlet.ServletException;
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16 import javax.servlet.ServletOutputStream;
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17 import javax.servlet.http.HttpServletRequest;
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18 import javax.servlet.http.HttpServletResponse;
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19
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20 import digilib.image.DocuImage;
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21
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22 /**
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23 * A class for handling user requests for pdf documents from digilib images.
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24 *
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25 * If a document does not already exist, it will be enqueued for generation; if it does exist, it is sent
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26 * to the user.
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27 *
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28 * @author cmielack
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29 *
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30 */
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31
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32 @SuppressWarnings("serial")
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33 public class PDFCache extends RequestHandler {
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34
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35 private DigilibConfiguration dlConfig = null;
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36
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37 public static String instanceKey = "digilib.servlet.PDFCache";
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38
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39 private DigilibJobCenter<OutputStream> pdfJobCenter = null;
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40
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41 private DigilibJobCenter<DocuImage> pdfImageJobCenter = null;
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42
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43 private File cache_directory = new File("cache");
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44
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45 private File temp_directory = new File("pdf_temp");
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46
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47 private static String JSP_WIP = "/pdf/wip.jsp";
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48
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49 private static String JSP_ERROR = "/pdf/error.jsp";
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50
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51 public static Integer STATUS_DONE = 0; // document exists in cache
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52
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53 public static Integer STATUS_WIP = 1; // document is "work in progress"
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54
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55 public static Integer STATUS_NONEXISTENT = 2; // document does not exist in cache and is not in progress
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56
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57 public static Integer STATUS_ERROR = 3; // an error occurred while processing the request
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58
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59 public static String version = "0.3a";
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60
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61 // TODO ? functionality for the pre-generation of complete books/chapters using default values
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62
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63
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64 public void init(ServletConfig config) throws ServletException {
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65 super.init(config);
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66
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67 System.out.println("***** Digital Image Library Image PDF-Cache Servlet (version "
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68 + version + ") *****");
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69 // say hello in the log file
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70 logger.info("***** Digital Image Library Image PDF-Cache Servlet (version "
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71 + version + ") *****");
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72
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73 ServletContext context = getServletContext();
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74 dlConfig = (DigilibConfiguration) context.getAttribute("digilib.servlet.configuration");
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75 if (dlConfig == null) {
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76 // no Configuration
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77 throw new ServletException("No Configuration!");
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78 }
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79
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80 String temp_fn = dlConfig.getAsString("pdf-temp-dir");
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81 temp_directory = new File(temp_fn);
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82 if (!temp_directory.exists()) {
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83 // try to create
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84 temp_directory.mkdirs();
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85 }
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86 if (!temp_directory.isDirectory()) {
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87 throw new ServletException("Configuration error: problem with pdf-temp-dir="+temp_fn);
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88 }
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89 // rid the temporary directory of possible incomplete document files
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90 emptyDirectory(temp_directory);
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91
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92 String cache_fn = dlConfig.getAsString("pdf-cache-dir");
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93 cache_directory = new File(cache_fn);
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94 if (!cache_directory.exists()) {
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95 // try to create
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96 cache_directory.mkdirs();
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97 }
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98 if (!cache_directory.isDirectory()) {
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99 throw new ServletException("Configuration error: problem with pdf-cache-dir="+cache_fn);
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100 }
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101
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102 pdfJobCenter = (DigilibJobCenter<OutputStream>) dlConfig.getValue("servlet.worker.pdfexecutor");
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103 pdfImageJobCenter = (DigilibJobCenter<DocuImage>) dlConfig.getValue("servlet.worker.pdfimageexecutor");
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104
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105 // register this instance globally
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106 context.setAttribute(instanceKey, this);
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107
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108 }
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109
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110 /**
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111 * clean up any broken and unfinished files from the temporary directory.
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112 */
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113 public void emptyDirectory(File temp_dir){
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114 File[] temp_files = temp_dir.listFiles();
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115
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116 for (File f: temp_files){
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117 f.delete();
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118 }
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119 }
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121
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122 public void processRequest(HttpServletRequest request,
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123 HttpServletResponse response) {
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124
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125 // evaluate request ( make a PDFJobDeclaration , get the DocumentId)
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126 PDFJobDescription pdfji = new PDFJobDescription(request, dlConfig);
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127
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128 String docid = pdfji.getDocumentId();
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129
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130 // if some invalid data has been entered ...
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131 if(!pdfji.checkValidity()) {
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132 notifyUser(STATUS_ERROR, docid, request, response);
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133 return;
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134 }
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135
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136 int status = getStatus(docid);
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137
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138 if (status == STATUS_NONEXISTENT) {
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139 // not there -- start creation
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140 try {
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141 createNewPdfDocument(pdfji, docid);
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142 notifyUser(status, docid, request, response);
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143 } catch (FileNotFoundException e) {
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144 // error in pdf creation
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145 logger.error(e.getMessage());
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146 notifyUser(STATUS_ERROR, docid, request, response);
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147 }
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148 } else if (status == STATUS_DONE) {
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149 // pdf created -- send it
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150 try {
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151 sendFile(docid, getDownloadFilename(pdfji), response);
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152 } catch (IOException e) {
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153 // sending didn't work
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154 logger.error(e.getMessage());
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155 }
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156 } else {
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157 // should be work in progress
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158 notifyUser(status, docid, request, response);
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159 }
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160 }
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161
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162 /**
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163 * depending on the documents status, redirect the user to the appropriate waiting or download page.
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164 *
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165 * @param status
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166 * @param documentid
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167 * @param request
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168 * @param response
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169 */
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170 public void notifyUser(int status, String documentid, HttpServletRequest request, HttpServletResponse response){
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171
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172 String jsp=null;
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173
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174 if(status == STATUS_NONEXISTENT){
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175 // tell the user that the document has to be created before he/she can download it
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176 logger.debug("PDFCache: "+documentid+" has STATUS_NONEXISTENT.");
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177 jsp = JSP_WIP;
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178 } else if(status == STATUS_WIP){
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179 logger.debug("PDFCache: "+documentid+" has STATUS_WIP.");
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180 jsp = JSP_WIP;
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181
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182 // TODO: estimate remaining work time
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183 // TODO: tell the user he/she has to wait
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184 } else if(status == STATUS_DONE){
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185 logger.debug("PDFCache: "+documentid+" has STATUS_DONE.");
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186 } else {
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187 logger.debug("PDFCache: "+documentid+" has STATUS_ERROR.");
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188 jsp = JSP_ERROR;
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189 }
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190
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191 try {
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192 // forward to the relevant jsp
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193 ServletContext context = getServletContext();
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194 RequestDispatcher dispatch = context.getRequestDispatcher(jsp);
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195 dispatch.forward(request, response);
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196 } catch (ServletException e) {
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197 logger.debug(e.getMessage());
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198 e.printStackTrace();
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199 } catch (IOException e) {
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200 logger.debug(e.getMessage());
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201 e.printStackTrace();
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202 }
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203
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204 }
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205
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206
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207 /** check the status of the document corresponding to the documentid */
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208 public Integer getStatus(String documentid){
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209 // looks into the cache and temp directory in order to find out the status of the document
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210 File cached = new File(cache_directory, documentid);
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211 File wip = new File(temp_directory, documentid);
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212 if(cached.exists()){
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213 return STATUS_DONE;
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214 } else if (wip.exists()){
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215 return STATUS_WIP;
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216 } else {
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217 return STATUS_NONEXISTENT;
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218 }
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219 }
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220
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221 /**
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222 * create new thread for pdf generation.
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223 *
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224 * @param pdfji
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225 * @param filename
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226 * @return
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227 * @throws FileNotFoundException
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228 */
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229 public Future<OutputStream> createNewPdfDocument(PDFJobDescription pdfji, String filename) throws FileNotFoundException{
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230 // start new worker
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231 File of = this.getTempFile(filename);
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232 OutputStream os = new FileOutputStream(of);
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233 PDFStreamWorker job = new PDFStreamWorker(dlConfig, os, pdfji, pdfImageJobCenter);
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234 // start job
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235 Future<OutputStream> jobTicket = pdfJobCenter.submit(job);
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236 // what do we do with the result?
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237 return jobTicket;
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238 /* PDFMaker pdf_maker = new PDFMaker(context, pdfji,filename);
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239 new Thread(pdf_maker, "PDFMaker").start();*/
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240 }
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241
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242
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243 /**
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244 * generate the filename the user is going to receive the pdf as
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245 *
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246 * @param pdfji
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247 * @return
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248 */
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249 public String getDownloadFilename(PDFJobDescription pdfji){
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250 // filename example: digilib_example_pgs1-3.pdf
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251 String filename;
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252 filename = "digilib_";
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253 filename += pdfji.getAsString("fn");
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254 filename += "_pgs" + pdfji.getAsString("pgs");
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255 filename += ".pdf";
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256
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257 return filename;
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258 }
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259
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260 /**
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261 * sends a document to the user
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262 *
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263 * @param cachefile The filename of the document in cache.
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264 * @param filename The filename used for downloading.
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265 * @param response
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266 * @throws IOException
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267 */
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268 public void sendFile(String cachefile, String filename, HttpServletResponse response) throws IOException{
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269 File cached_file = null;
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270 FileInputStream fis = null;
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271 ServletOutputStream sos = null;
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272 BufferedInputStream bis = null;
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273
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274 try {
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275 // get file handle
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276 cached_file = new File(cache_directory, cachefile);
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277 // create necessary streams
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278 fis = new FileInputStream(cached_file);
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279 sos = response.getOutputStream();
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280 bis = new BufferedInputStream(fis);
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281
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282 int bytes = 0;
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283
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284 // set http headers
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285 response.setContentType("application/pdf");
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286 response.addHeader("Content-Disposition", "attachment; filename="+filename);
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287 response.setContentLength( (int) cached_file.length());
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288
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289 // send the bytes
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290 while ((bytes = bis.read()) != -1){
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291 sos.write(bytes);
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292 }
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293 }
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294 catch(Exception e){
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295 logger.error(e.getMessage());
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296 }
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297 finally{
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298 // close all streams
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299 if (fis != null)
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300 fis.close();
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301 if (bis != null)
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302 bis.close();
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303 if (sos != null)
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304 sos.close();
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305 }
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306
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307 }
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308
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309 public File getCacheDirectory(){
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310 return cache_directory;
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311 }
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312
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313 public File getTempDirectory(){
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314 return temp_directory;
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315 }
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316
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317 /**
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318 * returns a File object based on filename in the temp directory.
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319 * @param filename
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320 * @return
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321 */
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322 public File getTempFile(String filename) {
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323 return new File(temp_directory, filename);
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324 }
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325
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326 /**
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327 * returns a File object based on filename in the cache directory.
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328 * @param filename
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329 * @return
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330 */
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331 public File getCacheFile(String filename) {
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332 return new File(cache_directory, filename);
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333 }
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334 }